Add support for rust proc-macro crates

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+## Rust proc-macro crates
+
+Rust has these handy things called proc-macro crates, which are a bit like a
+compiler plugin. We can now support them, simply build a [[shared_library]] with
+the `rust_crate_type` set to `proc-macro`.
+
+```meson
+proc = shared_library(
+  'proc',
+  'proc.rs',
+  rust_crate_type : 'proc-macro',
+  install : false,
+)
+
+user = executable('user, 'user.rs', link_with : proc)
+```